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OTL, Output Transformerless Amplifier User Group.

RE: M60

"Not seeing the need to limit the current to either the filament or driver transformers, I left the CL-30 connected to only the output supply transformer fuse"

Inrush current on heaters is MASSIVE relative to their quiescent current. I wouldn't be surprised if a single 6336 wanted 10A of inrush current on the heaters. I suspect that the CL-30 is there to help mitigate that. I would also not use Hexfreds, they are obsolete/inferior technology.

What's always missing from write-ups like this is the report 2-5 years down the road regarding reliability.

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  Michael Percy Audio  

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